Fixup! Add metrics on splicing (#2756)

[pm47]

We were considering all local outputs as splice outputs, but some may be change.

[codecov-commenter]

Codecov Report

Merging #2759 (1ef7e6d) into master (e4103a2) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@            Coverage Diff             @@
##           master    #2759      +/-   ##
==========================================
- Coverage   85.87%   85.87%   -0.01%     
==========================================
  Files         216      216              
  Lines       18089    18090       +1     
  Branches      737      785      +48     
==========================================
  Hits        15534    15534              
- Misses       2555     2556       +1     

Files	Coverage Δ
...ain/scala/fr/acinq/eclair/channel/Monitoring.scala	95.91% <100.00%> (ø)
...inq/eclair/channel/fund/InteractiveTxBuilder.scala	91.50% <100.00%> (+0.02%)	⬆️

... and 5 files with indirect coverage changes